metrics: improve getGCSafePointWithRetry metrics (#10807)

[CalvinNeo]

close #10808

What problem does this PR solve?

Issue Number: close #xxx

Problem Summary:

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

None

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: JaySon-Huang, JinheLin
Once this PR has been reviewed and has the lgtm label, please assign yudongusa for approval. For more information see the Code Review Process.
Please ensure that each of them provides their approval before proceeding.

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Details

Needs approval from an approver in each of these files:

• OWNERS [JaySon-Huang,JinheLin]
• dbms/src/Interpreters/OWNERS

Approvers can indicate their approval by writing /approve in a comment
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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2026-04-23 07:50:44.905909944 +0000 UTC m=+2238650.111269991: ☑️ agreed by JinheLin.
• 2026-04-23 07:50:52.337929511 +0000 UTC m=+2238657.543289568: ☑️ agreed by JaySon-Huang.

[CalvinNeo]

/retest

[ti-chi-bot]

@CalvinNeo: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-sanitizer-asan	bf54099	link	false	/test pull-sanitizer-asan
pull-integration-test	bf54099	link	true	/test pull-integration-test

Full PR test history. Your PR dashboard.

Details

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository. I understand the commands that are listed here.

[CalvinNeo]

/retest pull-integration-test

[ti-chi-bot]

@CalvinNeo: The /retest command does not accept any targets.
The following commands are available to trigger required jobs:

/test pull-integration-test

/test pull-unit-test

The following commands are available to trigger optional jobs:

/test pull-error-log-review

/test pull-sanitizer-asan

/test pull-sanitizer-tsan

Use /test all to run the following jobs that were automatically triggered:

pingcap/tiflash/pull_integration_test

pingcap/tiflash/pull_unit_test

pull-sanitizer-asan

pull-sanitizer-tsan

Details

In response to this:

/retest pull-integration-test

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[CalvinNeo]

/test pull-integration-test

[CalvinNeo]

Note this branch has unhealthy version. So it can't success. Bypass it.